thank you for the tip. re-install the whole ROM with boot.img from OP but it didn't help.
0. boot into TRWP and wiped all except the SDCard storage and OTG
1. installed ROM
2. isntalled boot.img
3. install gapps (nano)
4. reboot to system
5. confirmed USB Configuration is MTP in Developer Option
eh? while typing above out and touching the MTP option. confirmed i can access the internal and SDCard storages via PC USB conection now. don't know what triggered it but looks okay now.
hm.. looks like touching the MTP choice will help but not fully functional. sometime you get the parent folders, sometime none and if you are lucky you get all.
will pop out the sdcard and stick into the reader to transfer files from PC for time being.